did you already perform a terrain correction on the image?
If not, please be aware of the specifics of SAR acquisition geometry; Sentinel-1 is a so-called right-looking satellite acquires images in ascending and descending orbit. Depending on the current orbit from the scene, the image appears “flipped”.
You can find more information in this related post:
Before seeing your answer, I applied the “Geolocation Grid” correction and the img seemed to flip back to how it should be. However, after that operation, I could not apply Radiometric Flattening, error says that “Source product should not be map projected”.
I have not found anywhere to use the Flip. I think it is in NEST toolbox rather than SNAP/S1Tbx. I will try the Range Doppler Terrain Correction to see if the img be flipped back.
I have put my name in the EO-College course already.
What I intend to do with S1 SAR: The cloudy weather blocks me from having good Sen2 img. I used those images to visually detect the forest cutover on the ground. Now I hope with S1 SAR I can somehow see through the “cloud” to see those cutovers.
Our cutover site sometimes can be small 100m x 100m but I still can see it on Sentinel 2. I’m not sure if that dimension is too small for Sentinel 1 ?